DRY-DRILLING BIT DESIGN: Engineered for accurate dry drilling in porcelain and natural stone tile, for a precise, clean hole BUILT-IN WAX INSERT IN TIP: Lubricates and cools the hole DRILLING CONTROL: Drilling without water allows two hands to guide the tool VACUUM-BRAZING TECHNOLOGY: Fuses high-quality diamonds to the bit tip for 10x longer bit life in porcelain than standard glass and tile bits HIGH-QUALITY DIAMONDS: Help provide ease of use in drilling into porcelain, as well as up to 10x life in porcelain than standard glass and tile bits